Hi, Canadians need a visa to enter Cuba. The visa is just a slip of paper that you write your name on. Your airline will give this paper out on the plane. You just fill it in and hold it with you. You will need it when you pass customs at the airport to enter Cuba. The customs guy when you enter will take half of the paper (it cuts down the middle). Your landlord will also take it for a few hours in order to register you in the casa. When you exit Cuba, the customs guy will take the other half.
It’s super simple. Dont worry about anything. Have a great trip.
Mario